scribner



2 Sheets-Sheet 1-.

(No Model.)

0. RSGRI NE ELECTRIC ARC LAMP.

No. 563,315. Patented July '7, 1896.

(No Model.) 2 Sheefis-Sheet 2.

C. E. SGRIBNER. ELECTRIC ARC LAMP.

Patented July 7, 1896.

11am ember yum/ W w Q74;

UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE \VESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 563,315, dated July 7, 1896. Application filed January 2, 1883. Serial No. 80,751. (No model.)

To all whom it may concern: the current automatically from the first rod Be it known that I, CHARLES E. SORIBNER, (Z to the second rod at the proper time. 55 a citizen of the United States, residing at Chi- This switching device is operated by the first cago, in the county of Cook and State of Illirod, preferably by means of the collar g.

nois, have inventeda certain new and useful As the carbons of the first rod burn away Improvement in Switching Devices for Arcthe collar is brought lower and lower until Lamps, (Case N o. 53,) of which the following finally it comes against the lower prong of 60 is a full, clear, concise, and exact description, the switch f. The rod dis thus arrested and reference being had to the accompanying can descend no farther. The carbon-points IO drawings, forming a part of this specification. of rod d, however, continue to burn, and the My invention relates to electric-arc lamps resistance of their are becomes greater and in which two sets of carbon-points are progreater until finally the arc is extinguished. 65 vided, so that when one set is consumed the Before the arc of the first pair of carbons is other set may be automatically brought into thus extinguished the collar g brings the circuit. Lamps are thus made to burn twice switch-lever f down, so as to close the circuit as long as when provided with only a single at point i to the second rod 6. The rod (Z, set of carbons. being arrested by the stop g, cannot descend 70 My invention consists in the circuits and farther. The rod 6, however, will be fed switching device herein described and down and the second set of carbons will be claimed. brought together. It will therefore be but a In the drawings, Figure 1 is a perspective moment at most after the first arc goes out view of an electric-arc lamp embodying my before the other are will begin to burn. 75 improvements. Fig. 2 is a detailed View of Any well-known form of clutch maybe used. the switching device. Fig. 3 is a view show- The switching device shown in detail in ing the lifting-armature and clutches in de- Figs. 2 and 5 consists of a bifurcated lever tail. Fig.4isaview showingamodified form pivoted as shown and a friction-spring 7a. of the switching device. Fig. 5 is a diagram The collar in its descent comes against the So illustrative of the circuits. lower prong and carries the lever into contact Like parts are indicated by similar letters with point 2, as before described. On raising of reference throughout the several views. the rod the collar is brought against the up- The lifting-armature a carries two clutches per prong and thus lifts the lever, separating b and 0. Each clutch is designed to operate the lever from the contact-point v). The lever 8 5 the rod of one of the sets of carbons. The is held in position by the friction of spring 7;. clutch l) operates rod cl, and clutch c operates In Fig. 5 the lever is shown in contact with 3 5 rod E. point 2'. On raising the rod the collar comes The clutches being both attached to the against the lower side of the upper prong of same armature move uniformly synchronicthe lever, and the lever is thus lifted away 0 ally, carrying with them the two rods while the from point '2". The lever is carried so far that lamp is burning. The rods d and e move the collar in its descent may pass by the up- 40 together all the time the lamp is burning. per prong freely, the friction of the spring it During the burning of the first set, that is, holding the lever in the position in which it the set operated by rod (2, there is no circuit esis left by the collar. The second rod 6 is in- 5 tablished through rode and its set of carbons, sulated from the frame and all parts of the the circuit of this set being open at point lamp, so that no current can pass through it When carbon-rod d feeds, carbonrod is also until circuit is closed by the descent of the released and the carbons come together. first rod. As the resistance of the are ill- The clutch 0 thus goes through the motion of creases the compensating magnet Z, included 100 feeding every time clutchb feeds. This does in the shunt of the arc, will become more no harm, since the opening of clutch o of the strongly charged, and consequently the resistsecond set has no effect whatsoever upon ance of the variable rheostat a in the shunt clutch Z) of the first set and since there is no around the lifting-magnet will be diminished. circuit through the second set. Therefore the current will be diverted from 10 5 The switching device f is adapted to change the lifting-magnet and the clutches will release their hold upon the rods respectively. It will be seen that at the moment the second set of carbons come together the current finds circuit through them, thereby short-circuiting and extinguishing the first arc. Immediately the second set of carbons are separated and their are established. The contact of the second set of carbons which short circuits the arc of the first set also short-circuits the regulating-magnet, thus directing the current through the lifting-magnet, separating the carbons and establishing the new are, as before stated. This will be understood by reference to Fig. 5, in which the apparatus is shown in the act of shifting from one set to the other. The collar g has come against the switch f and the circuit has just been closed at point 1 through the second set of carbons. At this moment three circuits in derived circuitor multiple arc may be traced-- one circuit through the first set of carbons, as at first; a second circuit through the second set by switch f and point 2'; a third. circuit through the upper magnet, (shown in Fig. 5,) which magnet I have termed the regulating electromagnet. Of the three circuits the one of lowest resistance is through the second set by contact-point i, since the second set are in contact at the moment of shifting. In Fig. 5 the carbons of the second set are shown just as they have been in contact and drawn apart to establish the arc.

There being very little resistance in the second set at the moment they are closed, the first set at that moment will be shunted and their are extinguished; also at the same time the regulating-magnet will be shunted by the same short circuit through the second set. This causes the lifting-magnet to become active, and both clutches are lifted and with them both rods, and the arc is estab lished at the second set. Although the rod of the first set is lifted at the same time that the rod of the second is thus lifted, no arc can be established at the first set, since the first set were not previously closed.

This regulating and compensating mechanism, being claimed in other of my pending applications, is not included as a part of the invention herein described except in combination as hereinafter set forth.

In Fig. 4 I have shown a modified form of switching device. A simple point is placed upon the rod d, so as to close upon point 'i when the rod descends. It will thus be seen that the switching device f may be made in many different forms and operated automatically by the rod in different ways without departin g from my invention.

1 have shown and described two sets of carbons only; but it is evident that three or more sets may be used, by adapting the sec ond rod to close the circuit to the third, and so on, at the proper time.

I do not claim, broadly, means whereby the normally open shunt-circuit through the second burning pair of carbons is closed, as I am aware that this is accomplished indirectly in Patent No. 266,240 to Edward Veston and Patent No. 322,115 to Charles Lever, by causing the switch to first close circuit through an electromagnetic device, which in turn acts to close the normally open shunt circuit through the second burning pair of carbons; but what I do claim in this regard is any means whereby a switch is actuated by the carbon-rod of the first burning pair of carbons to directly complete the normally open shunt through the second burning pair of carbons. I believe myself to be the first, however, to provide, in connection with the switch actuated by the carbon-rod, means whereby the second burning pair of carbons remain normally in contact during the burning of the first pair, and in this connection I do not desire to limit myself to the particular means by which the switch, actuated by the carbonrod of the first burning pair of carbons, acts to effect the closing of the shunt through the second burning pair, since it is evident that the switch may act either directly or indirectly to complete the shunt-circuit through the second burning pair of carbons.

I claim as my invention 1. The combination with two carbon-rods the second of which is insulated, of a bifurcated switch-lever, a contact-point and a collar attachedto the first rod, said collar in its descent being adapted to pass the upper prong of the lever and come against the lower prong thereof and in its ascent to come against the upper prong, a friction-spring adapted to retain the lever in position and circuits substantially as and for the purpose specified.

2. The combination in an electric-arc lamp with the pivoted switch-lever adapted to make and break contact with the contact-point t, of the carbon-rod d, and a friction-spring mounted upon the lamp-frame and adapted to hold said switch-lever in either of the two positions to which it may be moved by the upward and downward movement of the rod, substantially as and for the purpose specified.

3. The combination with two pairs of carbons, of carbonrods, each carrying the movable member of one pair of carbons, regulating mechanism controlling the said carbonrods, a projection or collar on one of the said rods, a switch-lever adapted to engage with said projection at a predetermined point in the descent of the rod and a device or prong connected with said switch-lever adapted to be thrown into the path of the projection above the same when the lever is moved by the descent of the projection or collar, said device being positively acted upon by the projection to reset the switch-lever when the rod is raised, substantially as described.

In witness whereof I hereunto subscribe my name this 16th day of November, A. D. 1882.

CHARLES E. SORIBNER. lVitnesses GEORGE P. BARTON, P. A. STALEY. 

